Floor surfacing machine



Jan. 19,1932. H. L. FlNK 1,841,368

FLOOR SURFAC ING MACHINE Filed May 21, 1928 Patented Jan. 19,1932 f i UNITED T S PATENT OFFICE],

. HARRY-L- RIN F Yong? v f Application filed May 21, 1928.. Seria1 i To.'27e,229.

My invention relates tofloor surfacing mathe center of gravity of the motor, butsubchines of the class usually employed for sta-ntially back of. the grinders and housings grinding or finishing terrazzo mosaic, mar- 3,24 and 5, so-that the natural gravity balance ble or composition floors, of the machme willapply suflic ent pressure 6 Especially the invention relates to the cont t stones,-and at the same timethe rear- 55 struction and arrangement of supporting and Wa V Ih ng f h In perml e m traversing wheels for such machines. Chlne h t dj p t W l to e vat The general object is to provide two dishe h 1 undlzle 659111 f the 0p.- tinct and separately-revoluble wheels, mount- If i j r T g 10 ed on a single axle, having conoidal, or mutuhe Wheels are shghtlyj spaced apart, and 60 ally-crowned tread-surfaces, and so arranged t? r n ed s n l y n longitudinal as to constitute (except for the grinding surahgnment w th the grinders, WheIItWO gr1nd faces or st-ones) the entire support of the are pr p 'w en t e I on y 0I1e machine, by which it may be properly travgrlnder, lts ax1s lntersects the longitudinal ersed over the floor surface, swing or tilted r l 3X15 f h machme, Whlch also 65 laterally, or easily rolled while the grinders sects axle/11 w e the w are held in elevated position and inactive, The l filmed-Surfaces 15 are 'modwithout necessity for any additional or auxa el y rounded, l a 9 m y iliary supporting wheels or rollers. J l h portlons of largest diameter The characteristics and advantages of the g, l mwerd a la a 70 invention are further sufiiciently explained in ther; and the 1mmed1ately-ad acent por connection with the following detail descript1011s 0f the threads re Ie ab uptly tion of the accompanying drawings, which lh P as at (Wold y Sharp edges show one preferred embodiment. After con- WhlCh mlgh SGOI'e h fi s ace. sidering this example, skilled persons will T PrOVlde for e y m en 0f e a- 75 understand that many variations may be ,t Wheels are pref rably mounted on made, and I contemplate the employment of h ll l n h llng In the present speany structures that are properly within the e a p these e roller. g 1 scope of the appended laims, cludlng rollers 20 runnlngbetween the axle Fig. 1 is a side elevation of a machine emand wheel races 21, and held in place by end 80 bodying the invention in one form. plates 22, w1th thrust or spacing washers 23 Fig. 2 is a section at 22, Fig. 1. lnterposed' between the plates and brackets Fig. 3 is a front elevation, on reduced scale. 14, When deslred- The central spaclng of the The frame 1 supports near its rear end the Wheels is maintained by a plate 24:, one end motor 2, and at its front end, housings 3, 4 of which is located in or secured to the frame and 5, enclosing, respectively, gearing, veras at 5, and e Other e iS ap d tical shafts, and the grinding head supportreceive and surround the. axle, and act as a ing the grinders proper, or stones 6. In some Spacer between the inward plates 22. This cases there may be only one grinder. The plate 24 also acts as a guard or scraper, premotor is connected to the gearing by shafts venting accumulation of ground-dust or and a flexible coupling 7 Handle struts 8 other debris, which would, otherwise tend to are connected to the rear end of the frame. clog the wheels, or to cause them to rotate to The entire support of the machine (aside gether, which is undesirable in certain mafrom the grinders) is provided by two wheels neuvers, as will appear from the following 10, mounted for independent rotation on an explanation 'of operation: 95 axle 11. V This axle is secured by caps 12 and While grinding, the machine is pushed forscrews or bolts 13 to the ends of lugs or brackward and backward with comparative ease ets 14: which depend from the frame sides, by reason of the anti-friction wheel bearings. V

and may be integral therewith. The axle The lateral balance of the machine is easily i I 1s preferably located somewhat forward of maintained because of the wide combined tread of the two broad wheels; but at the same time the machine is easily tilted in its transverse vertical plane, either by floor-inequalities acting upon the grinders, or in- 5 tentionally by the operator to properly grind 01f high spots, the rearward part of the machine in such tilting, rocking upon the wide arcuate lateral support alforded by the mutual crown or curvature of the wheel treads. The machine is also easily swung laterally, in the horizontal plane, to sweep the grinders over desired zones of the floor surface, because of the independentirevoluble a. mounting of the wheels, which may revolve at any necessary different speeds in the same or opposite directions, to, freely permit such swinging' When it is desired to raise the grinders out of contact with the floor,this is easily accomplished by downward pressure upon the handles, the machine framethen pivoting at the axle center, because of the location of the axle at a favorable point in relation to the longitudinal center of gravity, as above referred to, and without necessity'for' any additional or auxiliary wheels or rollers to support the machine in this position, such as have heretofore been necessary in certain machines of this general class. I claim: 7 1. In a floor-surfacing machine, in combination with the frame, motor and one or more grinders, and twosupporting and traversing wheels independently-revolubly mounted on a common axis, the wheels being substantially spaced apart and means located between them to prevent accumulation of dbris and clogging. v

2. In a floor-surfacing machine, in combination with the frame, motor and one or more grinders, and two supporting and traversing wheels independently-revolubly mounted on a common axis, and a scraper plate located between the wheels. V In testimony whereof I affix my signature.

HARRY L. FINK. 

